638375171524 has 6 divisors (see below), whose sum is σ = 1117156550174. Its totient is φ = 319187585760.

The previous prime is 638375171519. The next prime is 638375171527. The reversal of 638375171524 is 425171573836.

It can be written as a sum of positive squares in only one way, i.e., 590684473600 + 47690697924 = 768560^2 + 218382^2 .

It is not an unprimeable number, because it can be changed into a prime (638375171527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79796896437 + ... + 79796896444.

Almost surely, 2^638375171524 is an apocalyptic number.

It is an amenable number.

638375171524 is a deficient number, since it is larger than the sum of its proper divisors (478781378650).

638375171524 is a wasteful number, since it uses less digits than its factorization.

638375171524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159593792885 (or 159593792883 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 52.

The spelling of 638375171524 in words is "six hundred thirty-eight billion, three hundred seventy-five million, one hundred seventy-one thousand, five hundred twenty-four".